What is the difference between and in java

Question

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What's the difference between <?> and <? extends Object> in Java Generics? (3 answers)

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In Java generics, What is the advantage of using class GenericStack<T extends Object> {} over class GenericStack<T>{}.

I have implemented a generic stack using both of the above approaches but unable to trace out the difference. Help me to understand this.

Answer 1

There's no difference. <T> and <T extends Object> are equivalent.